How To Fix WL392 - Maximum node number reached in process execution (endless loop?)

SAP Error Message - Details

• Message type: E = Error

• Message class: WL - Workflow: run-time messages

• Message number: 392

• Message text: Maximum node number reached in process execution (endless loop?)

What causes this issue?

At present, a maximum of &V3& nodes are allowed in one workflow - see
settings for workflow runtime system or basic data of the workflow
definition. During execution of the confirmation for work item &V1&,
the node counter was increased to value &V2& while step number &V4& was
being processed.

System Response

The workflow was stopped as a precaution.

How to fix this error?

Please check the various steps of the workflow in the workflow log:
If an endless loop is actually occurring, please correct the workflow
definition accordingly.
In order to continue the current process, execute the option <LS>Edit
-> Set upper limit</> in the report program <DS:TRAN.SWPR>Restart
workflow</>.
If the configured <LS>maximum node number</> for this workflow is too
small, you should increase the maximum node number for this workflow
definition in the basic data in the Workflow Builder for the following
new workflow instances.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WL392 - Maximum node number reached in process execution (endless loop?) ?

  The SAP error message WL392, which states "Maximum node number reached in process execution (endless loop?)", typically indicates that a workflow process has exceeded the maximum number of nodes that can be executed in a single workflow instance. This can happen due to various reasons, including:
  Causes:
  
  Endless Loop: The workflow may be designed in such a way that it keeps looping through a set of nodes without reaching a termination point.
  Complex Workflow Design: A workflow with too many branches or nodes can lead to reaching the maximum limit set by the system.
  Incorrect Workflow Configuration: Misconfigured workflow steps or conditions that lead to repeated execution of the same nodes.
  System Limitations: The SAP system has predefined limits for the number of nodes that can be executed in a single workflow instance.
  
  Solutions:
  
  Review Workflow Design: Check the workflow definition for any loops or conditions that may cause it to repeat nodes indefinitely. Ensure that there are proper exit conditions.
  Optimize Workflow: Simplify the workflow by reducing the number of nodes or branches if possible. This can help in avoiding hitting the maximum node limit.
  Increase Node Limit: If the workflow design is correct and you still need more nodes, consider increasing the maximum node limit in the system settings. This should be done with caution and typically requires consulting with your SAP Basis or technical team.
  Debugging: Use the workflow log and debugging tools to trace the execution path of the workflow. This can help identify where the loop is occurring.
  Testing: After making changes, thoroughly test the workflow to ensure that it behaves as expected and does not enter an endless loop.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or patches related to this error.
  Workflow Monitoring: Use transaction codes like SWI1 (Workflow Overview) or SWI2_FREQ (Work Item Selection) to monitor and analyze workflow instances.
  Documentation: Refer to SAP documentation on workflow design best practices to avoid common pitfalls that lead to such errors.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage SAP support for further assistance.